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Why can't variable names start with numbers?
...a string of digits would be a valid identifier as well as a valid number.
int 17 = 497;
int 42 = 6 * 9;
String 1111 = "Totally text";
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Is it OK to use == on enums in Java?
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Thanks! I guess if I had just thought to step into .equals() with the compiler I would have seen this...
– Kip
Feb 10 '09 at 21:44
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iPhone Data Usage Tracking/Monitoring
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The thing is that pdp_ip0 is one of interfaces, all pdpXXX are WWAN interfaces dedicated to different functions, voicemail, general networking interface.
I read in Apple forum that :
The OS does not keep network statistics on a process-by-process basis. As suc...
Do try/catch blocks hurt performance when exceptions are not thrown?
...Stopwatch w = new Stopwatch();
double d = 0;
w.Start();
for (int i = 0; i < 10000000; i++)
{
try
{
d = Math.Sin(1);
}
catch (Exception ex)
{
Console.WriteLine(ex.ToString());
}
}
w.Stop();
Conso...
Clang optimization levels
...m-as < /dev/null | opt -O3 -disable-output -debug-pass=Arguments
As pointed out in Geoff Nixon's answer (+1), clang additionally runs some higher level optimizations, which we can retrieve with:
echo 'int;' | clang -xc -O3 - -o /dev/null -\#\#\#
Documentation of individual passes is availabl...
String contains - ignore case [duplicate]
...lic boolean regionMatches(boolean ignoreCase,
int toffset,
String other,
int ooffset,
int len)
ignoreCase : if true, ignores case when comparing characters.
public static boolean co...
Does Java support default parameter values?
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@JarrodRoberson: Interesting way of forcing correct use via the compiler, thanks for sharing! Friendly suggestion for future posts: 300 lines of uncommented source code is probably a bit much to digest for most people (code is harder to read ...
Safely override C++ virtual functions
...function with the correct signature does not exist
void handle_event(int something) override;
};
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PostgreSQL wildcard LIKE for any of a list of words
... I think using lower() is ineffective because it will first convert each string to lowercase, which is more costly than only a case-insensitive match
– gilad mayani
Sep 20 '19 at 10:57
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In .NET, which loop runs faster, 'for' or 'foreach'?
...stem;
using System.Diagnostics;
using System.Linq;
class Test
{
const int Size = 1000000;
const int Iterations = 10000;
static void Main()
{
double[] data = new double[Size];
Random rng = new Random();
for (int i=0; i < data.Length; i++)
{
...